I think my sticking point is that it's not 30 of your coins, necessarily. This is probably where I'm going wrong, but I might only have 100 coins, but there's a multitude of people that have 1,000 coins, and some still that have 10,000 coins.

I feel like I'm muddling up production/living standards and just plain wealth, but not every individual would need to give 30%. There would be a total amount equaling 30% that is re-allocated.